Estudio de viabilidad, modelo de negocio e infraestructura de aeropuertos de almacenamiento y mantenimiento de aeronaves

Due to the global pandemic that the world is suffering these days, the aeronautical industry is feeling one of the worst crisis ever seen. Many airports are looking for alternative ways to generate money due to the very low passenger aircraft operations. This has brought forward the business model of the current maintenance and storage airports that has achieved better economic results than pre-pandemic times. Besides, the more and more complex aircraft and the continuous growth of the aeronautical sector, excluding the global sanitary crisis, makes aircraft maintenance one of the main potential fields to develop airports with low passenger rates. The content of the project is divided into eight chapters. First, the maintenance and storage airport concept is detailed in order to see what implies and which differences there are between passenger and maintenance airports in terms of infrastructure, capabilities, systems and personnel needed. The second chapter addresses the evolution of the MRO (Maintenance, Repair and Overhaul) market through the years and how it has been changed according to new regulations and necessities. Besides, it includes an MRO market forecast reviewing the estimations and predictions of the market. Chapter three is focused on the business model of these airports through a business model canvas and SWOT analysis. The fourth chapter covers one of the main maintenance and storage airports in Europe, Teruel Airport. It details the main activities performed, the companies operating there and the finance evolution and results of the airport. Chapter five establishes an airport type proposal collecting the common characteristics of the airports and the most important requirements needed to carry out maintenance and storage operations. Chapter six suggest one current airport with low revenues to change its business model in order to improve its results and become a viable facility. Chapter seven includes the conclusions and the recommendations to continue to project and go deeper in the analysis of some aspects. Finally, the future project planning to establish a guideline to continue the project and improve even more the study

Análisis de rendimiento de la PC Odroid C2 para su uso en esquemas de ciudades inteligentes

Dentro de las llamadas ciudades inteligentes, las redes de sensores para el monitoreo de diversas métricas como calidad del aire, densidad vehicular, entre otros, cobran particular importancia por la información que proporcionan. Estas redes envían sus datos a un punto central de procesamiento para su análisis e interpretación; sin embargo, en muchas ocasiones el envío de estos datos se realiza a través de canales de comunicaciones poco seguros y con baja relación de señal a ruido (signal-to-noise-ratio, SNR), tales como canales inalámbricos. En el presente trabajo, se propone el uso de la PC Odroid C2 como herramienta para implementar un codificador de convolución como esquema de codificación de canal que permita que los datos transmitidos sean menos susceptibles al ruido, así como para otro tipo de procesos relacionados con el área. Se estudia de la misma forma una tecnología similar: la PC Raspberry Pi versión 3, anexando pruebas de benchmarking de ambas PC

Vitiligo-like lesions located over In-transit metastases of malignant melanoma as a clinical marker of complete response to pembrolizumab.

Anti-programmed cell death (PD)-1 therapies in metastatic tumors have a high incidence of immune adverse events, including cutaneous manifestations such as vitiligo-like lesions. This side effect is associated with increased survival and it is a clinical marker of response to treatment. This case report is a graphic representation of the appearance of vitiligo-like lesions over in-transit metastases of malignant melanoma linked to a complete response to treatment with pembrolizumab

Factors of accessibility and quality in Mexican cybermedia: Chihuahua case

Los medios de comunicación digital han crecido en Chihuahua debido al incremento constante de acceso a Internet (INEGI, 2017). Con el objetivo de conocer la calidad y la accesibilidad como herramienta para que cualquier persona sin importar su condición física pueda acceder a los contenidos, y tomando como base un modelo de análisis, se compararon nueve cibermedios. Utilizando 32 variables dicotómicas, para evaluar la calidad y tres herramientas online para conocer la accesibilidad. Los resultados muestran un buen desarrollo en accesibilidad, pero un bajo índice en calidad. Uno de los factores que podría estar afectando es la constante inseguridad que ha prevalecido.The digital media have grown in Chihuahua due to a constant increase in Internet access (INEGI, 2017). With the aim of knowing the quality and accessibility as a tool to access the contents, based on a model of analysis, nine cybermedia are compared. Using 32 dichotomous variables, to evaluate the quality and three online tools to know the accessibility. The results show a good development in accessibility, but a low quality index. One of the factors that could be affecting the constant insecurity that has prevailed

Nodal involvement evaluation in advanced cervical cancer: a single institutional experience

Purpose: To assess the usefulness of different imaging techniques in the detection of nodal involvement in patients with advanced cervical carcinoma. Moreover, to analyze the correlation between the presurgical (FIGO) and postsurgical (pTNM) staging classifications. Materials and Methods: All patients diagnosed with advanced cervical cancer (FIGO Stages IIB-IV) from 2005 to 2012 were selected. The medical charts of 51 patients that underwent presurgical assessment with posterior surgical staging by means of paraaortic lymphadenectomy, were reviewed. Nodal status assessment by computed tomography scan (CT scan), magnetic resonance imaging (MRI), positron emission tomography (PET), and sonography was compared, as well as the size given in imaging techniques compared to the final pathologic report information. Results: Presurgical analysis by CT scan, MRI, PET, and sonography showed pelvic nodal involvement in 51.3% of patients, and para-aortic involvement in 30.8% of cases. CT scan showed positive pelvic nodes in 35% of cases, but pathologic confirmation was observed in just 17.6% of cases. However, MRI resulted in higher rates of up to 48.8% of cases. Concerning para-aortic nodal involvement, CT scan showed positive nodes in 25% of cases, MRI in 3.2% of cases, and the pathologic report in 15.6% of cases. The authors found significant differences between staging groups among both classifications (FIGO vs. pTNM; p < 0.001). Eight cases (15.7%) were understaged by FIGO classification. Conclusions: Despite all imaging techniques available, none has demonstrated to be efficient enough to avoid the systematic study of para-aortic nodal status by means of surgical evaluatio

Focus group evaluation of an elective course design

This research led to determining the relevance of the curriculum designed by our Professional Training School for Teachers in Puebla, Mexico, regarding the dimensions of content and curricular order, based on the experience of students and teachers. The methodology has a qualitative approach; the technique was focus groups, and the instrument was a script of open questions that considered the internal evaluation of the process. It is in our best interest to strengthen the design and implementation of the "Inclusion, Art, Play, and Sport" course as part of a series of community-proposed optional courses. In the experience of students and teachers, the group met the general purpose. The feedback received through the focus groups cut in greater depth for students to identify the collective achievements of all the participants: students, teachers, and curriculum designers. Throughout the study, we identified aspects for improvement, such as rethinking some activities and learning evidence, reducing the amount of information to meet, and establishing a better relationship between the topics and the teaching practices, particularly those related to strategies for inclusion in art and sports

Planetary nebulae abundances and stellar evolution

A summary is given of planetary nebulae abundances from ISO measurements. It is shown that these nebulae show abundance gradients (with galactocentric distance), which in the case of neon, argon, sulfur and oxygen (with four exceptions) are the same as HII regions and early type star abundance gradients. The abundance of these elements predicted from these gradients at the distance of the Sun from the center are exactly the solar abundance. Sulfur is the exception to this; the reason for this is discussed. The higher solar neon abundance is confirmed; this is discussed in terms of the results of helioseismology. Evidence is presented for oxygen destruction via ON cycling having occurred in the progenitors of four planetary nebulae with bilobal structure. These progenitor stars had a high mass, probably greater than 5 solar masses. This is deduced from the high values of He/H and N/H found in these nebulae. Formation of nitrogen, helium and carbon are discussed. The high mass progenitors which showed oxygen destruction are shown to have probably destroyed carbon as well. This is probably the result of hot bottom burning.Comment: 9 pages, 2 Tables, 8 figures, A&A in pres

On the Excitation and Formation of Circumstellar Fullerenes

We compare and analyze the Spitzer mid-infrared spectrum of three fullerene-rich planetary nebulae in the Milky Way and the Magellanic Clouds; Tc1, SMP SMC16, and SMP LMC56. The three planetary nebulae share many spectroscopic similarities. The strongest circumstellar emission bands correspond to the infrared active vibrational modes of the fullerene species C60 and little or no emission is present from Polycyclic Aromatic Hydrocarbons (PAHs). The strength of the fullerene bands in the three planetary nebulae is very similar, while the ratio of the [NeIII]15.5um/[NeII]12.8um fine structure lines, an indicator of the strength of the radiation field, is markedly different. This raises questions about their excitation mechanism and we compare the fullerene emission to fluorescent and thermal models. In addition, the spectra show other interesting and common features, most notably in the 6-9um region, where a broad plateau with substructure dominates the emission. These features have previously been associated with mixtures of aromatic/aliphatic hydrocarbon solids. We hypothesize on the origin of this band, which is likely related to the fullerene formation mechanism, and compare it with modeled Hydrogenated Amorphous Carbon that present emission in this region.Comment: 13 pages, 2 tables, 7 figures, Accepted for publication in Ap

Analysis of online quizzes as a teaching and assessment tool

This article deals with the integrated use of online quizzes as a teaching and assessment tool in the general program of the subject Proyectos in the third course of Ingeniero Técnico en Informática de Gestión over five consecutive years. The research undertaken aimed to test quizzes effectiveness on student performance when used, not only as an isolated assessment tool, but also when integrated into a combined strategy, which support the overall programming of the subject. The results obtained during the five years of experimentation using online quizzes shows that such quizzes have a proven positive influence on students' academic performance. Furthermore, surveys conducted at the end of each course revealed the high value students accord to use of online quizzes in course instruction.Peer Reviewe